/* ===== CSS Variables ===== */
:root {
    --color-black: #0a0a0a;
    --color-blue: #2563eb;
    --color-blue-dark: #1d4ed8;
    --color-blue-light: #3b82f6;
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f4f4f5;
    --color-gray-200: #e4e4e7;
    --color-gray-300: #d4d4d8;
    --color-gray-400: #a1a1aa;
    --color-gray-500: #71717a;
    --color-gray-600: #52525b;
    --color-gray-700: #3f3f46;
    --color-gray-800: #27272a;
    --color-gray-900: #18181b;
    
    --font-heading: 'Instrument Serif', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --spacing-3xl: 8rem;
    
    --transition-fast: 150ms ease;
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

/* Offset for fixed nav when scrolling to anchors */
section[id] {
    scroll-margin-top: 80px;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

/* ===== Skip Link (Accessibility) ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.75rem 1.5rem;
    background: var(--color-gray-900);
    color: var(--color-white);
    font-weight: 500;
    border-radius: 0 0 8px 8px;
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* ===== Focus Visible Styles ===== */
*:focus-visible {
    outline: 2px solid var(--color-blue);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.4);
}

/* ===== Utility Classes ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-xl);
    max-width: 550px;
    line-height: 1.7;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    transition: box-shadow var(--transition-base);
}

.nav--scrolled {
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-600);
    position: relative;
    transition: color var(--transition-fast);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-blue);
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--color-gray-900);
}

.nav-links a:hover::after {
    width: 100%;
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-md);
    background: var(--color-white);
    position: relative;
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 1px 1px, var(--color-gray-200) 1px, transparent 0);
    background-size: 32px 32px;
    opacity: 0.8;
    pointer-events: none;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 120%;
    height: 80%;
    background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 400;
    color: var(--color-gray-900);
    line-height: 1.05;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.hero-title-accent {
    color: var(--color-blue);
    font-style: italic;
}

.hero-tagline {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
    line-height: 1.7;
    max-width: 550px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta-group {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-cta {
    display: inline-block;
    padding: 1rem 2rem;
    font-weight: 500;
    font-size: 0.9375rem;
    border-radius: 8px;
    transition: all var(--transition-base);
}

.hero-cta-primary {
    background: var(--color-gray-900);
    color: var(--color-white);
    box-shadow: 0 4px 14px 0 rgba(0, 0, 0, 0.15);
}

.hero-cta-primary:hover {
    background: var(--color-gray-800);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(0, 0, 0, 0.2);
}

.hero-cta-secondary {
    background: transparent;
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
}

.hero-cta-secondary:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-gray-300);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-blue);
    border-radius: 2px;
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    50% {
        opacity: 0.5;
        transform: translateX(-50%) translateY(12px);
    }
}

/* ===== Services Section ===== */
.services {
    padding: var(--spacing-3xl) 0;
    background: var(--color-white);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-gray-200), transparent);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    padding: var(--spacing-xl);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: 16px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-blue), var(--color-blue-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--spacing-md);
    padding: 12px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(59, 130, 246, 0.05));
    border-radius: 12px;
    color: var(--color-blue);
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* ===== Clients Section ===== */
.clients {
    padding: var(--spacing-xl) 0;
    background: var(--color-gray-50);
    border-top: 1px solid var(--color-gray-100);
    border-bottom: 1px solid var(--color-gray-100);
    overflow: hidden;
}

.clients .section-title {
    font-size: 0.875rem;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--spacing-lg);
    color: var(--color-gray-400);
    font-family: var(--font-body);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.clients .section-subtitle {
    display: none;
}

.clients-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

.client-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    flex-shrink: 0;
}

.client-logo img {
    height: 32px;
    width: auto;
    max-width: 120px;
    object-fit: contain;
    filter: grayscale(100%);
    opacity: 0.5;
    transition: all var(--transition-base);
}

.client-logo:hover img {
    filter: grayscale(0%);
    opacity: 1;
}

/* For logos with white/light elements that need dark background */
.client-logo--dark-bg {
    background: var(--color-gray-700);
    border-radius: 6px;
}

.client-logo--dark-bg img {
    filter: grayscale(100%) brightness(1.3);
    opacity: 0.8;
}

.client-logo--dark-bg:hover img {
    filter: grayscale(0%) brightness(1);
    opacity: 1;
}

@media (max-width: 768px) {
    .clients-grid {
        gap: var(--spacing-lg) var(--spacing-xl);
    }
    
    .client-logo img {
        height: 28px;
        max-width: 100px;
    }
}

/* ===== Testimonials Section ===== */
.testimonials {
    padding: var(--spacing-3xl) 0;
    background: var(--color-gray-50);
    position: relative;
}

.testimonials-quote-icon {
    display: block;
    width: 48px;
    height: 48px;
    color: var(--color-blue);
    opacity: 0.3;
    margin: 0 auto var(--spacing-xl);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.testimonial-card {
    text-align: center;
    padding: var(--spacing-lg);
}

.testimonial-text {
    font-family: var(--font-heading);
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    font-weight: 400;
    font-style: italic;
    color: var(--color-gray-800);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.testimonial-author {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

.testimonial-author-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.testimonial-author-name {
    font-weight: 600;
    color: var(--color-gray-900);
    font-size: 0.9375rem;
}

.testimonial-author-role {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

@media (max-width: 768px) {
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .testimonial-card {
        padding: var(--spacing-md) 0;
    }
    
    .testimonial-card + .testimonial-card {
        border-top: 1px solid var(--color-gray-200);
        padding-top: var(--spacing-xl);
    }
}

/* ===== Contact Section ===== */
.contact {
    padding: var(--spacing-3xl) 0;
    background: var(--color-gray-900);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(ellipse at right center, rgba(37, 99, 235, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.contact .container {
    max-width: 600px;
    position: relative;
    z-index: 1;
}

.contact .section-title {
    color: var(--color-white);
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.contact .section-subtitle {
    color: var(--color-gray-400);
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-300);
}

.form-group input,
.form-group textarea {
    padding: 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    border: 1px solid var(--color-gray-700);
    border-radius: 10px;
    background: var(--color-gray-800);
    color: var(--color-white);
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-500);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-blue);
    background: var(--color-gray-800);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.submit-btn {
    padding: 1rem var(--spacing-xl);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-white);
    background: var(--color-blue);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-base);
    align-self: flex-start;
    box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.4);
}

.submit-btn:hover {
    background: var(--color-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.5);
}

.submit-btn:active {
    transform: translateY(0);
}

.form-success {
    display: none;
    padding: var(--spacing-lg);
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid var(--color-blue);
    border-radius: 12px;
    text-align: center;
}

.form-success.visible {
    display: block;
}

.form-success p {
    color: var(--color-white);
}

.form-error {
    display: none;
    padding: var(--spacing-lg);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid #ef4444;
    border-radius: 12px;
    text-align: center;
}

.form-error.visible {
    display: block;
}

.form-error p {
    color: var(--color-white);
}

.form-error a {
    color: #fca5a5;
}

.form-error a:hover {
    color: var(--color-white);
}

.form-privacy {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    margin-top: var(--spacing-sm);
}

.contact-info {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-700);
    text-align: center;
}

.contact-info p {
    color: var(--color-gray-400);
    font-size: 0.9375rem;
}

.contact-info a {
    color: var(--color-blue-light);
    transition: color var(--transition-fast);
}

.contact-info a:hover {
    color: var(--color-white);
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-xl) 0;
    background: var(--color-gray-900);
    color: var(--color-gray-500);
    border-top: 1px solid var(--color-gray-800);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.footer-company {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-300);
}

.footer-legal {
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

.footer-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5rem;
}

.footer-copyright {
    font-size: 0.75rem;
    color: var(--color-gray-600);
}

.footer-ventures {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
}

.footer-ventures-label {
    color: var(--color-gray-600);
    text-transform: uppercase;
    font-size: 0.625rem;
    letter-spacing: 0.1em;
    font-weight: 500;
}

.footer-ventures a {
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.footer-ventures a:hover {
    color: var(--color-blue-light);
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-right {
        align-items: center;
    }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .nav-links a {
        font-size: 0.8125rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        text-align: center;
    }
    
    .section-subtitle {
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 480px) {
    .nav-logo img {
        height: 24px;
    }
    
    .nav-links {
        gap: var(--spacing-sm);
    }
    
    .hero {
        padding: var(--spacing-3xl) var(--spacing-sm) var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-cta-group {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta {
        width: 100%;
        text-align: center;
    }
    
    .submit-btn {
        width: 100%;
    }
    
    .service-card {
        padding: var(--spacing-lg);
    }
}

/* ===== Scroll Animations ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Hero elements don't need scroll animation - they're visible on load */
.hero .animate-on-scroll {
    opacity: 1;
    transform: none;
}

/* Active nav link */
.nav-links a.active {
    color: var(--color-blue);
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }
}